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The Chicago franchise focuses on the professional and private lives of the firefighters, police officers, emergency medical personnel, and legal professionals who serve the city of Chicago. A recurring and unifying theme of the four shows is Molly's,[1] a small bar owned by three firefighters which has been frequented by characters from all four shows. Dick Wolf has stated that most episodes in the franchise will end with a scene at Molly's, saying that "it's a great note on the end of every show that connects all the shows".[2]

In Fall 2018, NBC switched all three shows into consecutive time slots on Wednesday, beginning with Chicago Med at 8:00pm (ET).[3]

Chicago Justice follows the prosecutors and investigators at the Cook County State’s Attorney's Office. The Chicago P.D. episode "Justice" serves as the backdoor pilot. The series was canceled after one season.

When Firehouse 51 rescues the owner of a house on fire, they find him clutching a suspicious box, so the Chicago Intelligence Unit is brought in for further investigation, leading them to work with Special Victims Unit to take down a child pornography ring.

The team transports victims of a chemical leak to Chicago Med, where the bad situation turns even worse due to a grenade-carrying madman who claims to have a deadly airborne disease. After the explosion everybody starts to panic and begin to flee with the doctors telling everyone to stay put and puts Chicago Med on lock down

Christopher Herrmann is treated for stab wounds at Chicago Med, while a comatose woman rescued from a fire is discovered to be one of four patients given unnecessary chemotherapy by a doctor who may have killed Voight's wife.

Chicago detectives Lindsay and Dawson come to New York to assist in the hunt for two escaped murderers, one of whom is Greg Yates, who returns to Chicago and commits a triple homicide, so SVU detectives Benson and Tutuola come to Chicago to join in the investigation.

Assistant States Attorney Peter Stone has been assigned to help defend Burgess and conduct his own investigation of her shooting of an unarmed African American teenager who is accused of shooting her partner.

Severide finds himself slipping back into old habits as he continues to help Anna with a bone marrow procedure. He's brought into the District when his car is found to have caused a deadly crash and during the investigation, the Chicago police track down a group of carjackers who may be the key to proving Severide's innocence.

A warehouse fire leaves Olinsky's daughter and 38 others dead. Chicago P.D.'s Intelligence Unit does all it can to track down the arsonist behind this tragedy. In Justice, the prime suspect's attorney does everything he can to get him acquitted, while ASA Peter Stone works really hard to find the way to get justice for the victims of the attack.